<script type="text/javascript">
    /** 定义一些公共的属性和方法 */
    //世界航海地图集目录结构
    const catalog = [{
        type: "世界风貌",
        contents: ["世界国家和地区","世界地形"]
    },{
        type: "资源环境",
        contents: ["地质","油气资源"]
    },{
        type: "航海保障",
        contents: ["综合航海保障","航标系统"]
    },{
        type: "重点航区",
        contents: ["世界主要海区和海峡索引图","世界主要海区概况"]
    }]
    /** 暴露出这些属性和方法 */
    export default {
       catalog
    }
</script>